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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-normalizers.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-normalizers.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/analysis-normalizers.html" rel="nofollow" target="_blank">../en/analysis-normalizers.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<h2 class="title">
<a id="analysis-normalizers"></a>Normalizers<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/normalizers.asciidoc">edit</a>
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<p>Normalizers are similar to analyzers except that they may only emit a single
token. As a consequence, they do not have a tokenizer and only accept a subset
of the available char filters and token filters. Only the filters that work on
a per-character basis are allowed. For instance a lowercasing filter would be
allowed, but not a stemming filter, which needs to look at the keyword as a
whole. The current list of filters that can be used in a normalizer is
following: <code class="literal">arabic_normalization</code>, <code class="literal">asciifolding</code>, <code class="literal">bengali_normalization</code>,
<code class="literal">cjk_width</code>, <code class="literal">decimal_digit</code>, <code class="literal">elision</code>, <code class="literal">german_normalization</code>,
<code class="literal">hindi_normalization</code>, <code class="literal">indic_normalization</code>, <code class="literal">lowercase</code>,
<code class="literal">persian_normalization</code>, <code class="literal">scandinavian_folding</code>, <code class="literal">serbian_normalization</code>,
<code class="literal">sorani_normalization</code>, <code class="literal">uppercase</code>.</p>
<h3>
<a id="_custom_normalizers"></a>Custom normalizers<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/normalizers.asciidoc">edit</a>
</h3>
<p>Elasticsearch does not ship with built-in normalizers so far, so the only way
to get one is by building a custom one. Custom normalizers take a list of char
<a class="xref" href="analysis-charfilters.html" title="Character filters reference">character filters</a> and a list of
<a class="xref" href="analysis-tokenfilters.html" title="Token filter reference">token filters</a>.</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT index
{
  "settings": {
    "analysis": {
      "char_filter": {
        "quote": {
          "type": "mapping",
          "mappings": [
            "« =&gt; \"",
            "» =&gt; \""
          ]
        }
      },
      "normalizer": {
        "my_normalizer": {
          "type": "custom",
          "char_filter": ["quote"],
          "filter": ["lowercase", "asciifolding"]
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "foo": {
        "type": "keyword",
        "normalizer": "my_normalizer"
      }
    }
  }
}</pre>
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